kafka环境搭建

准备环境

• 系统
  CentOS release 6.6 (Final)

• 下载并解压
  wget http://mirror.bit.edu.cn/apache/kafka/0.8.0/kafka_2.10-0.8.0.tgz
tar -zxvf kafka_2.10-0.8.0.tgz

启动

1. 启动Zookeeper
bin/zookeeper-server-start.sh config/zookeeper.properties &

2. 启动kafka
bin/kafka-server-start.sh config/server.properties &

3. 创建topic
   我修改了默认的端口
   bin/kafka-topics.sh --create --zookeeper localhost:2182 --replication-factor 1 --partitions 1 --topic testweixuan &
   查看创建的topic
bin/kafka-topics.sh --list --zookeeper localhost:2182
   查看topic的详细信息
   bin/kafka-topics.sh --describe --zookeeper localhost:2182

4. 测试producer
   运行producer并在控制台中输一些消息：
   bin/kafka-console-producer.sh --broker-list 192.168.1.116:2182:9092 --topic testweixuan
5. 测试consumer
bin/kafka-console-consumer.sh --zookeeper 192.168.1.116:2182 --topic testweixuan --from-beginning
   注意：需要开两个终端

搭建开发环境

生产者代码

package com.fengtang;

import java.util.Properties;

import kafka.javaapi.producer.Producer;
import kafka.producer.KeyedMessage;
import kafka.producer.ProducerConfig;

/**
 * Create by fengtang
 * 2015/10/8 0008
 * KafkaDemo_01
 */
public class KafkaProducer {
    private final Producer producer;
    public final static String TOPIC = "TEST-TOPIC";
    private KafkaProducer() {
        Properties props = new Properties();
        /**
         * 此处配置的是kafka的端口
         */
        props.put("metadata.broker.list", "192.168.1.116:9092");

        /**
         *  配置value的序列化类
         */
        props.put("serializer.class", "kafka.serializer.StringEncoder");
        /**
         * 配置key的序列化类
         */
        props.put("key.serializer.class", "kafka.serializer.StringEncoder");

        props.put("request.required.acks", "-1");
        producer = new Producer<>(new ProducerConfig(props));
    }

    void produce() {
        int messageNo = 1000;
        final int COUNT = 10000;
        while (messageNo < COUNT) {
            String key = String.valueOf(messageNo);
            String data = "hello kafka message " + key;
            producer.send(new KeyedMessage<>(TOPIC, key, data));
            System.out.println(data);
            messageNo++;
        }
    }

    public static void main(String[] args) {
        new KafkaProducer().produce();
    }
}

消费者代码

package com.fengtang;

import kafka.consumer.ConsumerConfig;
import kafka.consumer.ConsumerIterator;
import kafka.consumer.KafkaStream;
import kafka.javaapi.consumer.ConsumerConnector;
import kafka.serializer.StringDecoder;
import kafka.utils.VerifiableProperties;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;

/**
 * Create by fengtang
 * 2015/10/8 0008
 * KafkaDemo_01
 */
public class KafkaConsumer {
    private final ConsumerConnector consumer;
    private KafkaConsumer() {
        Properties props = new Properties();
        /**
         * zookeeper 配置
         */
        props.put("zookeeper.connect", "192.168.1.116:2182");

        /**
         * group 代表一个消费组
         */
        props.put("group.id", "jd-group");

        /**
         * zk连接超时
         */
        props.put("zookeeper.session.timeout.ms", "400000");
        props.put("zookeeper.sync.time.ms", "200");
        props.put("auto.commit.interval.ms", "1000");
        props.put("auto.offset.reset", "smallest");
        /**
         * 序列化类
         */
        props.put("serializer.class", "kafka.serializer.StringEncoder");
        ConsumerConfig config = new ConsumerConfig(props);
        consumer = kafka.consumer.Consumer.createJavaConsumerConnector(config);
    }

    void consume() {
        Map topicCountMap = new HashMap();
        topicCountMap.put(KafkaProducer.TOPIC, new Integer(1));
        StringDecoder keyDecoder = new StringDecoder(new VerifiableProperties());
        StringDecoder valueDecoder = new StringDecoder(new VerifiableProperties());
        Map>> consumerMap = 
                consumer.createMessageStreams(topicCountMap, keyDecoder, valueDecoder);
        KafkaStream stream = consumerMap.get(KafkaProducer.TOPIC).get(0);
        ConsumerIterator it = stream.iterator();
        while (it.hasNext())
            System.out.println(it.next().message());
    }

    public static void main(String[] args) {
        new KafkaConsumer().consume();
    }
}

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0modelVersion>

    <groupId>com.fengtanggroupId>
    <artifactId>kafkademoartifactId>
    <version>1.0-SNAPSHOTversion>
    <packaging>jarpackaging>

    <name>kafkademoname>
    <url>http://maven.apache.orgurl>

    <properties>
        <project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
    properties>

    <dependencies>
        <dependency>
            <groupId>org.apache.kafkagroupId>
            <artifactId>kafka_2.10artifactId>
            <version>0.8.0version>
        dependency>
        <dependency>
            <groupId>log4jgroupId>
            <artifactId>log4jartifactId>
            <version>1.2.15version>
            <exclusions>
                <exclusion>
                    <artifactId>jmxtoolsartifactId>
                    <groupId>com.sun.jdmkgroupId>
                exclusion>
                <exclusion>
                    <artifactId>jmxriartifactId>
                    <groupId>com.sun.jmxgroupId>
                exclusion>
                <exclusion>
                    <artifactId>jmsartifactId>
                    <groupId>javax.jmsgroupId>
                exclusion>
                <exclusion>
                    <artifactId>mailartifactId>
                    <groupId>javax.mailgroupId>
                exclusion>
            exclusions>
        dependency>
    dependencies>
project>

解决报错

kafka.common.FailedToSendMessageException: Failed to send messages after 3 tries.

需要改动config文件夹下的server.properties中的以下两个属性

zookeeper.connect=localhost:2181改成zookeeper.connect=192.168.1.116 (自己的服务器IP地址):2182

以及默认注释掉的#host.name=localhost改成host.name=192.168.1.116 (自己的服务器IP地址)

成功截图